4 Pack KY‑008 5 V Laser Module – Laser Diode Expansion Board for DIY Projects

Product Description

The KY‑008 5V Laser Sensor Module is a compact laser diode board that emits a small, intense red laser dot when powered. It integrates the laser diode, current‑limiting resistor, and basic support components on a small PCB, so you can drive it directly from a 5V supply or a microcontroller pin (within current limits) without designing a constant‑current driver.

With a typical wavelength of around 650 nm and power in the low‑milliwatt range, this module is popular for Arduino and ESP32 projects such as laser tripwires, optical barriers, alignment markers, and simple laser‑pointer style effects. The three‑pin interface lets you connect 5V, GND, and a signal pin, making it easy to switch the laser on and off via a digital output or PWM.

Ideal Uses

• Laser tripwires and optical barriers when paired with a light sensor or photodiode receiver.
• DIY alignment tools for CNC/3D printers, jigs, or fixtures where a visible line/dot helps positioning.
• Interactive projects and displays, such as mini laser light shows or pointing indicators (within safe power limits).
• Educational demos for laser diodes, modulation, and basic optics.
• Simple status or pointer indicators in control panels and robotics projects.

Compatibility

• Works with Arduino, ESP32, and other microcontrollers by driving the signal pin from a digital output (with proper current considerations).
• Designed for 5V operation; many tutorials connect VCC=5 V, GND, and a signal pin for on/off control.
• Can be used in Raspberry Pi projects with a 5V supply, using a transistor or driver circuit if needed to keep current off the GPIO pin.
• Fits into standard “37‑in‑1” sensor kits and common KY‑series breakout collections, making it familiar to many hobbyists.

Key Features

• Red laser diode with typical wavelength around 650 nm, producing a visible red dot.
• Typical optical power in the 5mW class, suitable for low‑power indicator and educational use (not for cutting/engraving).
• Operating voltage around 3–5V, usually used at 5V for full brightness.
• Typical operating current around 20–30 mA, depending on module design.
• Three‑pin interface (S, VCC, GND):
• Signal (S) – connect to a microcontroller digital output.
• VCC – typically 5V.
• GND – ground reference.
• Includes an on‑board resistor to limit current to the laser diode, simplifying direct use with 5V.
• Small PCB footprint with standard header pins, easy to plug into breadboards or jumper wires.

Technical Specs (Typical, KY‑008)

• Exact values vary slightly by manufacturer; verify your specific module:
• Wavelength: ~650 nm (red).
• Laser Power: around ≤5 mW (class 3R/3A range; check labeling).
• Operating Voltage: 3–5V DC (commonly used at 5 V).
• Operating Current: ~20–30 mA    (laser on).
• Beam Type: dot‑shaped focused beam.
• Pins: 3‑pin header (S, VCC, GND).
• Module Size: small PCB roughly a couple of centimeters long (varies by vendor).

What’s Included

• 1 × KY‑008 5 V Laser Sensor Module
  (Variants may include different pin headers or packaging depending on supplier.)

Safety Note

• This is a laser device: never point the beam at eyes, reflective surfaces, or towards people or animals; even low‑power lasers can cause eye damage if misused.
• Use appropriate enclosures and beam paths if integrating into products, and follow local regulations regarding laser safety and labeling.
• Power the module only within its rated voltage and current range; over‑voltage or bypassing the current‑limiting resistor can damage the diode or increase safety risk.